Who’s aping whom?

For a practical at medical school on the subject of the nervous system, it was thought unwise to wire students up to a live electrical circuit, so we used worms instead. The task was to measure lumbricus terrestris’s giant neurons as they fired. My worm’s bruise-coloured rings concertinaed in a final effort to escape before I made the necessary incisions, stuck pins through its body, and connected its extremities to the electrodes.